CN103427628A - Predictive power control in a flat panel display - Google Patents

Predictive power control in a flat panel display Download PDF

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Publication number
CN103427628A
CN103427628A CN2013101833677A CN201310183367A CN103427628A CN 103427628 A CN103427628 A CN 103427628A CN 2013101833677 A CN2013101833677 A CN 2013101833677A CN 201310183367 A CN201310183367 A CN 201310183367A CN 103427628 A CN103427628 A CN 103427628A
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round
future image
power governor
output voltage
power
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CN2013101833677A
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CN103427628B (en
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金学成
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iWatt Inc
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iWatt Inc
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/028—Generation of voltages supplied to electrode drivers in a matrix display other than LCD
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Abstract

A Predictive Power Control (PPC) device within a TCON Bias IC that addresses an overdesign inefficiency and enables a low cost solution. A PPC block utilizes the next frame image data and interacts with a pulse width modulation (PWM) control block of internal regulators to proactively prepare the output voltages of a power regulator for the power requirements in one or more future frames, for example.

Description

Predicted power in flat-panel monitor is controlled
Technical field
The present invention relates to the power control apparatus for flat-panel monitor, and more specifically, relate to for carry out to prepare for flat-panel monitor the system of output voltage by future image information.
Background technology
Light-emitting diode (LED) just is used in various electronic application, for example architectural lighting of these electronic application, auto bulb and taillight, backlight for the liquid crystal display that comprises personal computer, notebook computer, HDTV, photoflash lamp etc.With the conventional light source such as incandescent lamp and fluorescent lamp, compare, LED has clear superiority, comprises that efficiency is high, directive property good, color stable, reliability are high, long service life, size is little and Environmental security.
LED is current driving apparatus, means that luminous flux (being brightness) that their produce is mainly the function of the electric current that passes through them that applies.Therefore, the electric current of regulating by LED is important control technology.In order to drive the large LED array by direct current (DC) voltage source, often use such as the booster type power inverter or the DC-DC switching power converter of fall-booster type power inverter etc. provides upper rail (top rail) voltage for a plurality of LED strings.In liquid crystal display (LCD) application of using LED-backlit, controller often is necessary to control concurrently a plurality of LED strings with the independently electric current setting for each LED string.Then this controller can control the brightness of the different piece of LCD independently.In addition, this controller can be switched on or switched off in mode regularly the different piece of LCD.In addition, by drive thin-film transistor (TFT) LCD panel with separation logic, image information is displayed on the LCD panel.
Tradition TFT LCD panel is driven by timing controller (TCON) bias voltage integrated circuit (IC), power supply, and this power supply provides a plurality of voltages with different current limits row and column with the drive TFT panel.Yet these traditional IC are passive types, and do not comprise any intelligence about " future " (next frame) view data, and therefore by super safety standard design, solved any unexpected variation in POL place electric current demand.This super safety standard design causes unwanted extra cost.
Summary of the invention
Predicted power in TCON bias voltage IC is controlled (PPC) device solves " super safety standard design " ineffectivity and is realized low-cost solution.The PPC piece utilizes the next frame view data and interacts with the PWM controll block of internal regulator, and the power supply requirement in one or more future frames on one's own initiative of for example take is prepared the output voltage of TCON bias voltage IC, so produces desirable solution.
An execution mode comprises the system and method for the power ratio control adjuster, comprise: during the period 1, receive the future image property information relevant to future image showing during second round on display, after the described period 1, occur described second round, before described second round, based on described future image property information generating power adjuster control signal, and, during second round, based on described power governor control signal, carry out precharge to described power governor output voltage.
Another execution mode comprises for controlling the system and method for power regulator, comprise: during the period 1, receive the future image property information relevant to future image showing during second round on display, occur after the described period 1 described second round; Before described second round, based on described future image property information generating power adjuster control signal; Revise the duty ratio for second round of power governor based on described power governor control signal, to reduce the maximum voltage ripple of the output voltage based on the power governor control signal, described power governor output voltage is coupled to assist and is showing the switch of described future image during described second round on described display.
The feature and advantage of describing in this specification not all, particularly, are considered accompanying drawing, specification and claims, and a lot of supplementary features and advantage will be apparent to those skilled in the art.In addition, it should be noted in the discussion above that word as used in this specification mainly totally selects for readable and guiding purpose, and can not be to be selected to define or to limit theme of the present invention.
The accompanying drawing explanation
By consider following detailed description together with accompanying drawing, can easily understand the instruction of the embodiments of the present invention.
Figure (FIG.) 1 diagram according to embodiment of the present invention for controlling the AS of LCD panel.
Fig. 2 diagram is according to the timing controller bias voltage module of embodiment of the present invention.
Fig. 3 diagram according to embodiment of the present invention for by using the flow chart of PREDICTIVE CONTROL generating output signal.
Fig. 4 diagram and the waveform that uses tradition control or be associated according to the power supply signal of the PREDICTIVE CONTROL of embodiment of the present invention.
Fig. 5 diagram is according to the precharging signal of the TCON bias voltage module of embodiment of the present invention with on the example of the impact of power supply ripple.
Fig. 6 A diagram is according to the example arrangement of the booster converter 206 of the be used as switching power converter of embodiment of the present invention/power supply 204.
Fig. 6 B diagram is according to the pwm signal that drives booster converter when operating with discontinuous conduction mode (DCM) of embodiment of the present invention with by the inductor current I of booster converter LOscillogram.
Embodiment
Accompanying drawing and following description only relate to the preferred embodiment of the present invention by the mode of explanation.The replaceable execution mode that it should be noted in the discussion above that these structures disclosed herein and method in following discussion will easily be considered to the feasible replaceable selection that can use in the situation that do not break away from the principle of invention required for protection.
To describe now some execution modes of the present invention in detail, its example is shown in the drawings.It should be noted in the discussion above that as long as feasible, can use similar or identical Reference numeral in the accompanying drawings, and can indicate similar or identical function.Accompanying drawing is only described embodiments of the present invention for purposes of illustration.Those skilled in the art will easily recognize from the following description, and the replaceable execution mode of the structure shown in this paper and method can be used in the situation that do not break away from principle of the present invention described herein.
System configuration
Figure (FIG.) 1 diagram according to embodiment of the present invention for controlling the AS of LCD panel.This system comprises image processor 102, and it can comprise (SOC) 104 of system on main leaf and timing controller 106.The signal of the image that image processor 102 generation expressions will show.Image processor 102 can be traditional, and generates the value that means the image value of each pixel in display.In embodiments of the present invention, image information is sent to TCON bias voltage module 110 (it is intelligent power), and is described in more detail below.110 pairs of various LCD panel drivers of TCON bias voltage module and buffer 120 provide power, LCD panel driver and buffer 120 by image-driven to LCD panel 130.
In one embodiment, LCD panel 130 comprises LED-backlit, and it is driven by LED-backlit driver 140 and power inverter 150.About in various execution modes, can how to operate other details backlight, the name that equals to submit on December 28th, 2011 referring to Kesterson is called the U.S. Patent Application Serial Number 13/339 of " Predictive Control of Power Converter for LED Driver " (PREDICTIVE CONTROL of the power inverter of LED driver), 196, it is incorporated into this in full by reference.
In the backlight LCD TV, because LCD does not produce light, so controlling LED, LED-backlit driver 140 produces backlight for the LCD panel.LCD panel 130 comprises LCD matrix or grid.In one embodiment, each pixel of image comprises three LCD, and each LCD controls a color of this pixel, for example, the redness in the RGB color system, green or blue, each LCD is called as sub-pixel in this example.
The related switch of each LCD tool, for example, traditional thin-film transistor (TFT) (not shown).Each TFT is attached to capable signal and column signal.The row and column of LCD is driven by LCD panel driver 120.In one embodiment, the row of LCD is connected by the grid that voltage is applied to associated TFT switch, and then, voltage signal, and data voltage for example, be applied to each row of presentation video value.In one embodiment, data voltage is applied to the source terminal of each TFT, and for this TFT, view data is sent in the specific cycle.Voltage signal is stored in the TFT capacitor, and LC load capacitance for example, until next update cycle of this image.The voltage impact that is applied to LCD can be by the light quantity of LCD.
TCON bias voltage 110 generates these voltages, and LCD panel driver/buffer 120 is applied to LCD panel 130 at reasonable time by them based on for example information from timing controller 106.TCON bias voltage 110 receives input voltage, 8V-14.7V for example, and by using the stepping boost pressure controller to generate the voltage signal (16V) for the TFT source electrode, for example, by using charge pump for the voltage signal of TFT grid (to generate, 35V ,-6V), by using the stepping step down voltage redulator, generate the voltage signal (3.3V) for system logic.
Traditional TCON bias voltage module 110 is passive, because they do not receive any information that relates to view data, for example, about future image frame or capable information.On the contrary, embodiments of the present invention receive the information that can be used for revising the power signal of output on power bus 118.Fig. 2 diagram is according to the timing controller bias voltage module (TCON bias voltage) 110 of embodiment of the present invention.In each execution mode, TCON bias voltage 110 for example can comprise pre-charge module 202, and it receives the information from image processor 102, such as the information of next picture frame and/or next image line.Pre-charge module 202 is used the information received from image processor 102 to generate power control signal, and it is sent to power supply 204.In each execution mode, this power supply can comprise one or more in boost pressure controller 206 (DCDC adjuster), step down voltage redulator 208 (DCDC linear regulator), positive charge pump 210 and/or negative charge pump 212.Power supply generates to the output voltage of power bus 118.
The embodiments of the present invention are used future image information, such as next frame information, next line information etc., and to power supply, precharge is carried out in output.As described below, the benefit of carrying out precharge to power supply is to reduce voltage drop when applying load, and this has reduced the size of required capacitor in power supply 204 (for example capacitor C1 (650) in Fig. 6).
An example is when image is displayed on LCD panel 130.In this example, the image that show is a frame on 120Hz LCD panel 130.Therefore, the duration of every frame is 8.33 milliseconds (one seconds 1/120).Suppose and have 1020 lines (OK), and LCD a line follows a line demonstration image, for example use interlacing scan or line by line scan, so every row must be shown in being less than 8.17 microseconds.
Suppose that TCON bias voltage IC110 is operated with 500kHz---be to be 2 μ S the PWM time cycle, the available window of 8.17 μ S means for every row so, internal controller for boost/stepping of stepping step down voltage redulator only can be used 4 cycles, and it may be not enough to the unexpected variation in desired output current level is made a response.Using the prior information of the power demand of next line (next piece, next frame), internal regulator can be better/makes a response quickly.Pre-charge module 202 considers that for example the future image information of next line, next frame, next piece generates predicted power control (PPC) value when expression adjuster/power supply 204 should start charging.If be greater than the PPC value of lastrow for the PPC value of this line, so this be about to need to be than the more power supply of lastrow so that good operation.Therefore, the PWM duty ratio of internal regulator will increase with the power requirement to increasing and make response.If be less than the PPC value of lastrow for the PPC value of this line, so this be about to need to be than lastrow power still less.Therefore, the PWM duty ratio of internal regulator will reduce or keep identical.
For this example, suppose when row x is in operation, for example, in the process in just being shown by LCD panel 130, for example, when row x is just driven, the image information of row x+1 generates IC110 for the TCON bias voltage and can use.Pre-charge module 202 is used algorithm to calculate the PPC value for row x+1, and will send this PPC Value Data to internal regulator/power supply 204.Because the PPC value for row x+1 is greater than the PPC value of (meaning that capable x+1 is brighter) row x, the PWM duty ratio that pre-charge module 202 will increase internal regulator is complementary with the power requirement with soon increase (when going x+1 when driven).This will reduce output voltage ripple and also help to be avoided any surge in electric current.
Replacedly, replace row information, information of forecasting can be the information in the next frame that will show, and can be as the VSYNC signal of synchronizing signal.
Fig. 4 diagram and the waveform that uses tradition control or be associated according to the power supply signal of the PREDICTIVE CONTROL of embodiment of the present invention.Fig. 4 (a) diagram is not used the waveform of the conventional power source of PREDICTIVE CONTROL.The pulse-width modulation of boosting (PWM) signal in Fig. 4 (c) generates the waveform in Fig. 4 (a).In conventional power source, power signal has target voltage level, such as in time T aThe voltage level at place.In time T bPlace applies load, for example shows the LCD image.The voltage level of power signal is in time T bPlace starts to reduce, and continues to reduce until in time T cPlace meets minimum voltage threshold.At T cPlace, the tradition PWM that boosts generates the voltage level make power signal and raises until it is in time T dPlace reaches the pulse signal of target level.Conventional power source is passive, because pwm signal generates in response to dropping to lower than the voltage of threshold value.
On the contrary, embodiments of the present invention are used Forecasting Methodology, wherein, use future image information so that for example, by making control signal (pwm signal) carry out precharge in lower voltage to the charging that starts power supply signal before being less than threshold value to power supply.In some cases, this pwm signal started to carry out precharge before applying load, and this has reduced significantly voltage drop and therefore can in power supply, use less capacitor.
With reference to Fig. 4 (b) and Fig. 4 (d).Information based on receiving from image processor 102, the information relevant with next picture frame or next line for example, pre-charge module 202 is determined should be in time T cSend pwm control signal in order to reduce voltage drop to power supply 204 before.In some embodiments, T cTherefore not being determined, based on the power management standard, can or can be programmable by for example using control register to make regularly by different threshold values, so that payment changes and reduces and there is no a too large overshoot.In one example, the soluble load current of power management standard and capacitor value.How early pwm control signal raises depends on various factors described herein, such as future frame/row monochrome information.In this example, as shown in Fig. 4 (d), pwm control signal is in time T aPlace raises, and maintenance is until time T d.Seen in Fig. 4 (b), due to until time T bAll do not apply load, the voltage level of prediction power supply signal is at T aWith T bBetween increase, when at T bWhen place applies load, voltage level descends (at T bWith T cBetween), and voltage level is in time T dPlace returns to target level.During change in voltage in the conventional power source than shown in for example Fig. 4 (a), when pre-charge module is used additional information when carrying out precharge on one's own initiative, reduce significantly (Fig. 4 (b)) with the change in voltage of target level.
Set forth now the description of the various execution modes with active charge.Fig. 3 diagram according to embodiment of the present invention for by using the flow chart of PREDICTIVE CONTROL generating output signal.For ease of discussing, use and use the example of information to be controlled about next frame when power supply starts to charge.The description of this paper also is applicable to the execution mode when using different information, and this difference information is such as next line information or show that the duration can shorter and more dynamic display mode, for example 3D pattern.
Image processor 102 receives the expression of 302 next image that will show.Image processor can be stored in this expression in the buffer of frame buffer for example.Image processor 102 (or having another processor of access right to next image representation) is determined the image intensity value of 304 next image of expression.Existence can be determined the whole bag of tricks, the algorithm of image intensity value.For example, in one embodiment, the intensity level of each pixel is merged, and for example summation, to identify next image intensity summation.In interchangeable execution mode, in the situation that use the local dimming LED-backlit, by using for example PWM duty ratio backlight, can indirectly determine image intensity information.
In one embodiment, use following formula:
S n = β n Σ n P i + β n - 1 Σ n - 1 P i
Wherein, S nImage intensity, β nAnd β N-1It is respectively the weight factor of next image (n) and just shown present image (n-1).P iIt is the image intensity of each pixel in image.This equation is sued for peace the image intensity of the whole pixels in image n and n-1, the wherein summation of the pixel intensity of each image weighting separately.For example,, if β n=1 and β N-1=0, image intensity (S so n) only be based on the image intensity of the pixel in next image that (at time n) will show.If β N-1Equal nonzero value, (at time n-1) just shown present image is to image intensity (S so n) contribution arranged.In interchangeable execution mode, (n) He (n-1) can refer to next line, piece or other groupings and current line, piece or other groupings.
In interchangeable execution mode, also can use the intensity level for the appended drawings picture, for example, for image n+1, n+2, n-2, n-3 etc., and each weighting separately.
In one embodiment, image processor 102 then can be based on S nDetermine the value that means overall strength.In one embodiment, generation forecast power is controlled (PPC) counting, and wherein the PPC counting is that scope is 0 to 15 value for example.In this example, be 0 when image is essentially PPC count value when black, and be counted as 15 when image is essentially PPC when white.In one embodiment, the counting of the PPC in 0 to 15 scope can be divided in fact linearly so that the intensity difference between the difference between PPC counting 3 and 4 and PPC counting 10 and 11 is identical in fact.Yet, in interchangeable execution mode, the PPC counting can be meaned each value with nonlinear way.
As mentioned above, in interchangeable execution mode, can the pixel based in row, piece or other pixel set determine S n, other images that next image that the pixel in this row, piece or other pixel set will show based on (time n) and/or (time n+1, n+2, n-1, n-2 etc.) will show.In addition, can determine with other equatioies and weighting the intensity level of image (row, piece).
Image intensity information is received by TCON bias voltage equipment 110.In the example of setting forth in the above, image intensity information is the form of PPC counting.Pre-charge module 202 in TCON bias voltage equipment 110 determines when 306 start to charge to the power supply output signal.In one embodiment, the intensity of next image based on showing generates pwm signal (or generating pump signal) at least partly.In one embodiment, the PPC counting means the intensity of next image and is the value between 0 and 15.With reference to Fig. 4, in one embodiment, T c(or T d) and T aBetween duration should be started charging for 15 intervals that mean the time that pwm signal raises with indication power supply 204 by linear partition.Maximum duty cycle based on power supply is determined position T aTime.In each execution mode, duration is relevant with the external capacitor value with load current with beginning/terminating point, therefore in one embodiment, and for example, based on the power management standard, by using for example control register, duration and beginning/terminating point can be programmable.
Therefore, if PPC is counted as zero, pwm signal is in time T so cPlace raises, if PPC is counted as 8, pwm signal is at whenabouts T so bPlace raises, if PPC is counted as 15, pwm signal is at whenabouts T so aPlace raises, and that is to say, even before applying and loading to power bus signal 118.This example is only exemplary, and it is contemplated that, based on future image information, can use the other technologies that start charging for determining when.
This predicted power control system and method are initiatively, because it is used to for example, start to be charged to power supply from the image information of () future frame, row and/or piece.This and dependent response and the legacy system that only based on current just shown image, starts charging form contrast.
Pre-charge module 202 sends 308 power control signals of pwm signal for example to power supply 204.Then power supply 204 generates 310 power signals, and it is the output on power bus 118.Power supply 204 for example can comprise one or more in booster converter 206, buck converter 208, positive charge pump 210 and/or negative charge pump 212.Operation in response to these equipment of power control signal is known.Referring now to Fig. 6 A and 6B, the example for booster converter 206 is described.
Fig. 6 A diagram can be used as the example arrangement of the booster converter 206 of switching power converter/power supply 204.In booster converter 206, when switching transistor Q1 conducting, energy is stored in inductor L.When switching transistor Q1 disconnects, energy is transferred to capacitor C1 (650) via diode D1, and as output voltage V O.The voltage divider that comprises resistance R 1 and R2 is coupled to produce expression V OSense feedback voltage V FB.V FBCan be used as feedback voltage, V OCan be coupled to power bus 118.
Fig. 6 B diagram drives the pwm signal 612 of booster converter 206 and passes through the inductor current I of booster converter 206 when operating with discontinuous conduction mode (DCM) LOscillogram.During the time period 601, pwm signal 612 is effective, thus actuating switch transistor Q1.Inductor current I LAlong with inductor L charges with speed m 1 Increase.Time period 601 is called as the charging interval, and by d 1T SProvide, wherein d 1The duty ratio of pwm signal 312, and T SIt is the cycle of pwm signal 612.During the time period 603, pwm signal is low, thus cut-off switch transistor Q1.Inductor current I LAlong with inductor L discharges with speed m 2Reduce, thereby diode current I is provided DAnd produce output voltage V on capacitor C1 O.Time period 603 is discharge times, and by d 2T SProvide, wherein d 2The time period T when inductor L discharges SPercentage.During the time period 605, inductor current I LBe approximately zero, because electric discharge fully of inductor L.Time period 605 is called as Dead Time, and by d 3T SProvide, wherein d 3The time period T when inductor current is zero SPercentage, after discharge cycle and before the beginning in next PWM cycle.
As mentioned above, pre-charge module 202 determines when pwm signal should raise.In this example, pwm signal 612 raise and remains to 626 in the time 622.Dotted line in Fig. 6 B means the predicted picture information based on from pre-charge module 202 and the pwm signal and the I that revise LSignal.
Fig. 4 (b) and (d) and Fig. 5 (a) and (b) mean the power signal to booster converter 206 and the prediction pwm signal according to embodiment of the present invention.The prediction pwm signal that Fig. 4 (d) and Fig. 5 (a) diagram are generated by pre-charge module 202.Replace as done (referring to Fig. 4 (a)) in legacy system based on voltage drop, in time T cActivate pwm signal, prediction is boosted pwm signal in time T aConducting/activation, this is the time before applying load.In this example, the PPC count value for or approach its maximum, for example 15.In Fig. 4 (b), power supply voltage signal has been shown, and as shown in the solid line in Fig. 5 (b).Change with the absolute value of the voltage signal of target voltage the absolute value that is significantly less than in the conventional power source example and voltage signal target voltage and change (referring to Fig. 4 (a)).The reduction of this change in voltage makes power supply 204 can use less capacitor, C1 (650) for example, and this reduces total system cost.
Fig. 5 means prediction pwm signal (Fig. 5 (a)) and the power supply signal (Fig. 5 (b)) when PPC is counted as the median (the about 7-8 for example, above in illustrated example) of scope.In this example, as shown in the dotted line in Fig. 5, pwm signal is in time T bBe activated, time T bApproximately with to execute the loaded time identical, and be for example in time T at power supply cDrop to lower than before threshold value.Power supply voltage signal is shown in broken lines in Fig. 5 (b).As pwm signal in time T aSituation about being activated, change with the absolute value of the voltage signal of target voltage the absolute value that still is significantly less than in the conventional power source example and voltage signal target voltage and change (referring to Fig. 4 (a)).As mentioned above, the reduction of this change in voltage makes power supply 204 can use less capacitor, C1 (650) for example, and this reduces total system cost.
" execution mode " mentioned in this specification or " execution mode " mean that specific features, structure or the characteristics of describing that combine with these execution modes are included at least one execution mode.The phrase " in one embodiment " or " execution mode " that in this specification, occur everywhere may not all relate to identical execution mode.
The some parts that means to present detailed description according to the algorithm operated on data bit in computer storage and symbol.These arthmetic statements and expression are that the those of ordinary skill in data processing field conveys to others skilled in the art's means most effectively for the essence of the work by them.Algorithm here, and usually be conceived to be cause desired result from consistent step (instruction) sequence.These steps are those steps that need the physical operations of physical quantity.Usually, although be not necessary, this tittle adopts and can be stored, shifts, combines, relatively and the form of electricity, magnetic or the light signal of other operations.Sometimes, be mainly for general reason, it is easily that these signals are called to position, value, element, symbol, character, term, numeral etc.In addition, under prerequisite without loss of generality, sometimes will require the specific arrangements of step of the expression of the physical operations of physical quantity or conversion or physical quantity to be called module or code devices is also easily.
Yet all these and similar terms will be associated with suitable physical quantity, and be only the labels that facilitates that is applied to these physical quantitys.Unless specifically stated otherwise, otherwise apparent from following discussion, should be understood that, run through whole specification, utilization is such as the discussion of " processing " or " calculating " or " calculation " or " determining " or " demonstration " or terms such as " determining ", refer to action and the processing of computer system or similarly following electronic computing device (such as special-purpose computer), this electronic computing device operation and conversion are represented as the data of physics (electronics) amount in computer system memory or register or other information storages, transmission or display device.
Some aspect of these execution modes comprises that form with algorithm is in treatment step described herein and instruction.Should be noted that, the treatment step of these execution modes and instruction can softwares, the mode of firmware or hardware realizes, and when the mode with software realizes, on the different platform that can be downloaded to be kept at and to be used by various operating system and operated by it.These execution modes can also be arranged in the computer program that can carry out on computing system
These execution modes also relate to the device of the operation for carrying out this paper.Can build specially this device for the purpose of for example special-purpose computer, or it can comprise the all-purpose computer that the computer program in being stored in computer activates selectively or reconfigures.This computer program can be stored in computer-readable recording medium, such as, but be not limited to, the dish of any type, comprise floppy disk, CD, CD-ROM, magneto optical disk, read-only memory (ROM), random access storage device (RAM), EPROM, EEPROM, magnetic or light-card, application-specific integrated circuit (ASIC) (ASIC) or be suitable for the medium of any type of store electrons instruction, and each in them is coupled to computer system bus.But memory can comprise store information/data/program and it is temporary transient to be or above-mentioned and/or other equipment of nonvolatile medium in any one, wherein, nonvolatile or non-temporary medium can comprise the memory/memory space more than minimum duration by the information storage.In addition, the computer related in this specification can comprise that uniprocessor can be maybe to adopt multiprocessor to design to increase the structure of computing capability.
The algorithm that this paper presents and demonstration do not relate to any specific computer or other devices inherently.Various general-purpose systems also can be used with together with the program of instruction according to this paper, or the more special-purpose device of provable structure to carry out these method steps be easily.To manifest the structure for various these systems from the specification of this paper.In addition, these execution modes are not described with reference to any specific programming language.Should be understood that, various programming languages can be used for realizing the instruction of execution mode described herein, and provide any reference to concrete syntax in order to realize with disclosed purpose this paper of best mode.
In addition, word as used in this specification is mainly totally selected from readable and guiding purpose, and can not be to be selected to define or to limit theme of the present invention.Therefore, these execution modes discloses the scope that is intended to illustrate and not to limit in the claims each execution mode of setting forth.
Although this paper has illustrated and described concrete execution mode and application, should be understood that, these execution modes are not limited to precise structure disclosed herein and assembly, and can not break away from the spirit and scope of defined each execution mode in claims and carry out various modifications, change and change on layout, operation and the details of these method and apparatus of these execution modes.
Once read this specification, it will be appreciated by those skilled in the art that other the replaceable designs for this system.Therefore, although have illustrated and described specific implementations of the present invention and application, but should be understood that, the present invention is not limited to precise structure disclosed herein and assembly, and can not break away from defined the spirit and scope of the present invention in claims and the various modifications, change and the change that be it will be apparent to those skilled in the art that on layout, operation and the details of these method and apparatus of the present invention disclosed herein.

Claims (26)

1. the method for the power ratio control adjuster comprises:
During the period 1, receive the future image property information relevant to future image showing during second round on display, after the described period 1, occur described second round;
Before described second round, based on described future image property information generating power adjuster control signal; And
Before the power governor output voltage drops to lower than threshold value, during described second round, based on described power governor control signal, described power governor output voltage is carried out to precharge, described power governor output voltage is coupled to switch, and described switch is assisted and showing described future image during described second round on described display.
2. the method for claim 1, wherein said future image property information is at least part of upper prediction load of described display when during described second round, showing described future image.
3. method as claimed in claim 2, the described part of wherein said display comprises at least one of row or column of Thin Film Transistor-LCD (TFT LCD).
4. the method for claim 1, wherein said step of described power governor being carried out to precharge started during described second round before described output voltage drops to lower than target voltage level.
5. the method for claim 1, wherein said power governor is controlled liquid crystal display (LCD) panel.
6. the method for claim 1, wherein said future image property information can comprise the information about the intensity of described future image.
7. the method for the power ratio control adjuster comprises:
During the period 1, receive the future image property information relevant to future image showing during second round on display, after the described period 1, occur described second round;
Before described second round, based on described future image property information generating power adjuster control signal; And
Revise the duty ratio for described second round of power governor based on described power governor control signal, to reduce the maximum voltage ripple of the described output voltage based on described power governor control signal, described power governor output voltage is coupled to switch, and described switch is assisted and showing described future image during described second round on described display.
8. method as claimed in claim 7, wherein said future image property information be when during described second round, showing described future image described display at least partly on the prediction load.
9. method as claimed in claim 8, the described part of wherein said display comprises at least one of row or column of Thin Film Transistor-LCD (TFT LCD).
10. method as claimed in claim 7, wherein, the step of the duty ratio of the described power governor of described modification causes in the increase of described output voltage before described output voltage drops to lower than target voltage level during described second round.
11. method as claimed in claim 7, wherein said power governor is controlled liquid crystal display (LCD) panel.
12. method as claimed in claim 7, wherein said future image property information can comprise the information about the intensity of described future image.
13. the control system of the predicted power for the power ratio control adjuster comprises:
Pre-charge module, be coupled as during the period 1, receive the future image property information relevant to future image showing during second round on display, after the described period 1, occur described second round, and based on described future image property information generating power adjuster control signal; And
Power governor, be coupled to described pre-charge module, during described second round based on described power governor control signal generating power regulator output voltage signal, described power governor output voltage is coupled to switch, and described switch is assisted and showing described future image during described second round on described display.
14. system as claimed in claim 13, wherein said power governor output voltage signal increased before described output voltage drops to lower than threshold value.
15. system as claimed in claim 13, wherein said future image property information be when showing described future image during described second round described display at least partly on the prediction load.
16. system as claimed in claim 15, the described part of wherein said display comprises at least one of row or column of Thin Film Transistor-LCD (TFT LCD).
17. system as claimed in claim 13, wherein said power governor output voltage increased during described second round before described output voltage drops to lower than target voltage level.
18. system as claimed in claim 13, wherein said power governor is controlled liquid crystal display (LCD) panel.
19. system as claimed in claim 13, wherein said future image property information can comprise the information about the intensity brightness of described future image.
20. system as claimed in claim 13, wherein said power governor is revised the duty ratio for described second round based on described power governor control signal, to reduce the maximum voltage ripple of the described output voltage based on described power governor control signal.
21. system as claimed in claim 20, wherein said future image property information be when showing described future image during described second round described display at least partly on the prediction load.
22. system as claimed in claim 21, the described part of wherein said display comprises at least one of row or column of Thin Film Transistor-LCD (TFT LCD).
23. system as claimed in claim 20, the duty ratio of wherein revising described power governor causes in the increase of described output voltage before described output voltage drops to lower than target voltage level during described second round.
24. system as claimed in claim 20, wherein said power governor is controlled liquid crystal display (LCD) panel.
25. system as claimed in claim 20, wherein said power governor is controlled liquid crystal display (LCD) panel.
26. system as claimed in claim 20, wherein, described future image property information can comprise the information about the intensity of described future image.
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